Alan,
Moulds, in his book "Australian Cicadas", mentions that the life cycle
of some species being 7 years and the North American "periodic" cicada
species do have life cycles of 13 and 17 years. Not all cicadas are
periodic and can be found in all years, such as the "6 o'clock" cicada
in Borneo. You might find this article interesting http://www.cims.nyu.edu/~eve2/cicadas.pdf
though it does only refer to US species.
Cheers,
Carl Clifford
On 10/01/2010, at 1:14 PM, Alan Gillanders wrote:
"Cicadas are known for having long, prime-number based life cycles"
G'day Ross et al,
I would love to hear from aan Australian entemologist on this. Regards,
Alan
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